Pen



FIG. 1 is a front elevational view of a pen showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is an exploded right side elevational view thereof;

FIG. 4 is a front elevational view of the pen with the cap placed on the end opposite the writing point;

FIG. 5 is an enlarged scale top plan view of FIG. 1;

FIG. 6 is an enlarged scale bottom plan view of FIG. 1; and

FIG. 7 is an enlarged scale top plan view of FIG. 4. 

The ornamental design for a pen, as shown and described. 